+
+ function client_error($msg, $code = 400, $content_type = 'json') {
+
+ static $status = array(400 => 'Bad Request',
+ 401 => 'Unauthorized',
+ 402 => 'Payment Required',
+ 403 => 'Forbidden',
+ 404 => 'Not Found',
+ 405 => 'Method Not Allowed',
+ 406 => 'Not Acceptable',
+ 407 => 'Proxy Authentication Required',
+ 408 => 'Request Timeout',
+ 409 => 'Conflict',
+ 410 => 'Gone',
+ 411 => 'Length Required',
+ 412 => 'Precondition Failed',
+ 413 => 'Request Entity Too Large',
+ 414 => 'Request-URI Too Long',
+ 415 => 'Unsupported Media Type',
+ 416 => 'Requested Range Not Satisfiable',
+ 417 => 'Expectation Failed');
+
+ $action = $this->trimmed('action');
+
+ common_debug("User error '$code' on '$action': $msg", __FILE__);
+
+ if (!array_key_exists($code, $status)) {
+ $code = 400;
+ }
+
+ $status_string = $status[$code];
+ header('HTTP/1.1 '.$code.' '.$status_string);
+
+ if ($content_type == 'xml') {
+ $this->init_document('xml');
+ common_element_start('hash');
+ common_element('error', NULL, $msg);
+ common_element('request', NULL, $_SERVER['REQUEST_URI']);
+ common_element_end('hash');
+ $this->end_document('xml');
+ } else {
+ $this->init_document('json');
+ $error_array = array('error' => $msg, 'request' => $_SERVER['REQUEST_URI']);
+ print(json_encode($error_array));
+ $this->end_document('json');
+ }
+
+ }
+